/Engine/Source/Runtime/MovieScene/Public/Evaluation/MovieScenePlayback.h
Get the range of frame numbers traversed over this evaluation range by flooring the lower bound, and ceiling the upper bound. For example: a time range of [1.5, 5.6] will yield the equivalent of [1, 6). A time range of (2.0, 2.9) will yield the equivalent of [2,3).
[TRange](API\Runtime\Core\Math\TRange)< [FFrameNumber](API\Runtime\Core\Misc\FFrameNumber) > GetTraversedFrameNumberRange() const